If the corresponding value of the object
a3ComSysBridgePortAddressIsStatic is isStatic(1), this object
indicates the local bridge port index (as reported by
a3ComSysBridgePortLocalIndex) for which this address MAC was
statically configured. If the object
a3ComSysBridgePortAddressIsStatic has the value isDynamic(2),
the value of this object is 0.